summaryrefslogtreecommitdiffstats
path: root/include/asm-x86_64/atomic.h
diff options
context:
space:
mode:
Diffstat (limited to 'include/asm-x86_64/atomic.h')
-rw-r--r--include/asm-x86_64/atomic.h70
1 files changed, 58 insertions, 12 deletions
diff --git a/include/asm-x86_64/atomic.h b/include/asm-x86_64/atomic.h
index fc4c5956e1e..50db9f39274 100644
--- a/include/asm-x86_64/atomic.h
+++ b/include/asm-x86_64/atomic.h
@@ -160,8 +160,8 @@ static __inline__ int atomic_inc_and_test(atomic_t *v)
/**
* atomic_add_negative - add and test if negative
- * @v: pointer of type atomic_t
* @i: integer value to add
+ * @v: pointer of type atomic_t
*
* Atomically adds @i to @v and returns true
* if the result is negative, or false when
@@ -178,6 +178,31 @@ static __inline__ int atomic_add_negative(int i, atomic_t *v)
return c;
}
+/**
+ * atomic_add_return - add and return
+ * @i: integer value to add
+ * @v: pointer of type atomic_t
+ *
+ * Atomically adds @i to @v and returns @i + @v
+ */
+static __inline__ int atomic_add_return(int i, atomic_t *v)
+{
+ int __i = i;
+ __asm__ __volatile__(
+ LOCK "xaddl %0, %1;"
+ :"=r"(i)
+ :"m"(v->counter), "0"(i));
+ return i + __i;
+}
+
+static __inline__ int atomic_sub_return(int i, atomic_t *v)
+{
+ return atomic_add_return(-i,v);
+}
+
+#define atomic_inc_return(v) (atomic_add_return(1,v))
+#define atomic_dec_return(v) (atomic_sub_return(1,v))
+
/* An 64bit atomic type */
typedef struct { volatile long counter; } atomic64_t;
@@ -320,14 +345,14 @@ static __inline__ int atomic64_inc_and_test(atomic64_t *v)
/**
* atomic64_add_negative - add and test if negative
- * @v: pointer to atomic64_t
* @i: integer value to add
+ * @v: pointer to type atomic64_t
*
* Atomically adds @i to @v and returns true
* if the result is negative, or false when
* result is greater than or equal to zero.
*/
-static __inline__ long atomic64_add_negative(long i, atomic64_t *v)
+static __inline__ int atomic64_add_negative(long i, atomic64_t *v)
{
unsigned char c;
@@ -339,29 +364,50 @@ static __inline__ long atomic64_add_negative(long i, atomic64_t *v)
}
/**
- * atomic_add_return - add and return
- * @v: pointer of type atomic_t
+ * atomic64_add_return - add and return
* @i: integer value to add
+ * @v: pointer to type atomic64_t
*
* Atomically adds @i to @v and returns @i + @v
*/
-static __inline__ int atomic_add_return(int i, atomic_t *v)
+static __inline__ long atomic64_add_return(long i, atomic64_t *v)
{
- int __i = i;
+ long __i = i;
__asm__ __volatile__(
- LOCK "xaddl %0, %1;"
+ LOCK "xaddq %0, %1;"
:"=r"(i)
:"m"(v->counter), "0"(i));
return i + __i;
}
-static __inline__ int atomic_sub_return(int i, atomic_t *v)
+static __inline__ long atomic64_sub_return(long i, atomic64_t *v)
{
- return atomic_add_return(-i,v);
+ return atomic64_add_return(-i,v);
}
-#define atomic_inc_return(v) (atomic_add_return(1,v))
-#define atomic_dec_return(v) (atomic_sub_return(1,v))
+#define atomic64_inc_return(v) (atomic64_add_return(1,v))
+#define atomic64_dec_return(v) (atomic64_sub_return(1,v))
+
+#define atomic_cmpxchg(v, old, new) ((int)cmpxchg(&((v)->counter), old, new))
+
+/**
+ * atomic_add_unless - add unless the number is a given value
+ * @v: pointer of type atomic_t
+ * @a: the amount to add to v...
+ * @u: ...unless v is equal to u.
+ *
+ * Atomically adds @a to @v, so long as it was not @u.
+ * Returns non-zero if @v was not @u, and zero otherwise.
+ */
+#define atomic_add_unless(v, a, u) \
+({ \
+ int c, old; \
+ c = atomic_read(v); \
+ while (c != (u) && (old = atomic_cmpxchg((v), c, c + (a))) != c) \
+ c = old; \
+ c != (u); \
+})
+#define atomic_inc_not_zero(v) atomic_add_unless((v), 1, 0)
/* These are x86-specific, used by some header files */
#define atomic_clear_mask(mask, addr) \